> For the complete documentation index, see [llms.txt](https://dev.guardian.hedera.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev.guardian.hedera.com/guardian/workspace/modules.md).

# Modules

Modules are reusable policy components. They encapsulate blocks, events, and configuration for a specific capability.

Each module isolates its internal structure from the policy. It exposes variables and input or output events as its external interface.

### Why use modules?

Use modules to:

* Reuse common policy logic across multiple policies.
* Keep complex policy workflows organized and maintainable.
* Exchange data with surrounding blocks through defined interfaces.

You can create, import, export, and add modules in the Policy Editor.

### Related

* Reference: [Modules Reference](/guardian/workspace/modules/modules-using-ui.md)
* Task: [How to compare Modules?](/guardian/workspace/modules/module-differentiation-using-ui.md)